Unit
1
Study Guide 1/2 G04 ~ Mathematics
LESSON 2: NUMBER SENTENCES What are number sentences?
A number sentence is an arrangement of numbers and symbols:
3 + 9 = 12 55 – 6 = 49 8 × 5 = 40 12 ÷ 2 = 6
You will not always work with number sentences. Sometimes a maths problem is expressed in words, and before you can solve it mathematically, you must first formulate a number sentence for the problem.
Example: The neighbour’s dog had puppies. There are 4 females and 3 males. How many puppies are there in total? Start by reading the problem again and writing down the information. Total number of puppies: 4 females plus 3 males
The question is not asking you to count the females and males separately, therefore you must write the number sentence as follows:
4+3=?
Now it is easy to solve the problem:
4+3=7
This is an example of a number sentence in which you add numbers together. You can also write a number sentence with
© Optimi
–,×
30
and
÷.
